A coil with a radius of 2 cm, the current in which is 10 A, is freely established in a uniform magnetic field with an induction of 1.5 Tesla. The induction lines are perpendicular to the plane of the coil. Determine the work done by external forces when the coil is rotated through an angle of 90° around an axis coinciding with the diameter of the coil. Assume that when the coil is turned, the current strength in it is maintained constant.
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